JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Online ISSN : 1881-1299
Print ISSN : 0021-9592
Transport Phenomena and Fluid Engineering
Investigation of Torque and Horizontal Load on a Paddle Impeller in Eccentric Mixing
Hitoshi TanabeRyuta Misumi Meguru KaminoyamaKazuhiko Nishi
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2018 Volume 51 Issue 3 Pages 197-202

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Abstract

The present study investigates the torque and horizontal load in eccentric mixing by measurement under various operating conditions. Time series data of torque and horizontal load were obtained, showing that torque and the horizontal load were periodically oscillating. Time-averaged torque in the laminar region and in the turbulence region increased proportionally with n and n2, respectively. A power number Np [—] vs. Reynolds number Re [—] diagram was obtained. For various mixing liquids, Np-Re correlated with one curve. For Re<10, Np was independent of rE. However, in the higher Re region, Np was proportional to rE. The torque in eccentric mixing was estimated from this figure. The time-averaged horizontal load, Favg, also increased with n. In the lower Re region, Favg was proportional to n. However, for Re>104, Favg was proportional to the square of n. A dimensionless number related to the horizontal load, NpFavg [—], was defined as NpFavg=n Favg dn3 d5. An NpFavg-Re diagram almost correlated with one curve at each rE and NpFavg was proportional to rE irrespective of Re. The horizontal load in eccentric mixing was estimated from this figure.

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© 2018 The Society of Chemical Engineers, Japan
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